I can provide some general information.
In many jurisdictions, therapist-patient confidentiality is protected by law, which means that therapists are legally required to keep their patients' discussions confidential, with certain exceptions. These exceptions typically include cases where there is a risk of harm to the patient or others.
If a person, including a murderer, talks to their therapist about their trauma or experiences, the therapist generally cannot disclose that information to law enforcement or anyone else without the patient's consent. This confidentiality is essential to ensure that individuals feel safe and comfortable seeking therapy and discussing sensitive issues honestly.
However, there are limits to confidentiality. If a therapist believes that the patient poses a credible threat of harm to themselves or others, they may have a legal obligation to report it to the appropriate authorities. This duty to warn or protect others from imminent harm is referred to as a "duty to warn" or "duty to protect" and may vary by jurisdiction.
It's important to note that the laws around therapist-patient confidentiality can be complex, and the specific rules may differ depending on the jurisdiction. If you have concerns about confidentiality, it's best to consult with a legal professional or a therapist who can provide guidance based on the laws in your area. Additionally, therapists often discuss confidentiality policies with their patients at the beginning of treatment to ensure transparency and mutual understanding.